Power Systems
A buchholz relay is used for

 protection of a transformer against all internal faults
 protection of a transformer against all external faults
 nether 1 nor 2
 both 1 and 2

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
In coal fired thermal power stations, what are the electrostatic precipitators used for?

 To keep the air heaters clean
All of these
 To collect the dust particles from the flue gases
 To remove dust particles setting on the bus bar conductors in the station switch yard

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
The skin effect shows that

 current density is more at the surface of the condutor
 current density is lower at the surface of the condutor
 current density is more at the centre of the condutor
 the distribution of AC current is uniform through the cross section of the conductor

ANSWER DOWNLOAD EXAMIANS APP